$day: 2;

body {
  @if $day==1 {
    background-color: red;
    color: red;
  }
  @if $day==2 {
    background-color: blue;
  }
  @if $day==3 {
    background-color: green;
  }
  @if $day<=3 {
    background-color: rgb(128, 94, 0);
  }
}
